There are a lot of new shows debuting this season, but before you find a new favorite TV program, don't forget about the shows you've learned to laugh and agonize over in the past few years. You know them; you love them--shows that feature an unbalanced medical professional, the con-artist working for the government, two vampire siblings, and a host of other lovable, wacky, sexy, and bold characters you’ve been waiting for months to see again.

Click through the slideshow below for a look at 20 of the most popular shows that are back on air with a new season, and find out where their storylines are going.